Real GDP and Nominal GDP

A base year provides the price and production benchmark used to calculate real GDP and compare economic performance over time. It should therefore represent relatively normal economic conditions, without an exceptional war, disaster, crisis, or extreme price disturbance. An abnormal year can make the resulting growth rates misleading. Hence option B is correct; A and D create distortion, while C cannot provide a meaningful benchmark.

The structure of an economy changes as new products and services appear, consumption patterns shift, industries expand or decline, and technology alters production. Periodically revising the base year updates the representative basket and weights used in constant-price calculations. This makes real GDP comparisons more relevant to the current economy. It does not eliminate nominal GDP, stop output measurement, or freeze actual prices, so A is correct.

Nominal GDP is calculated by multiplying quantities of final goods and services by the prices prevailing in each year. Between two years, both quantities and prices may change, so a rise in nominal GDP cannot reveal how much output actually increased and how much merely reflects inflation. Real GDP uses constant prices to address this problem. Therefore A is correct; the other statements incorrectly describe nominal GDP.

Real GDP measures current production while keeping prices fixed at the base-year level. Therefore, the current-year quantity of each final good is multiplied by its base-year price, and these values are added. Option B is correct because it removes the effect of changing prices. Option A would calculate nominal GDP, while future and average export prices are not used in the standard real-GDP formula.

Nominal GDP values the final goods and services produced in the current year at the prices prevailing in that same year. Thus, its general form is current quantity multiplied by current price, summed across final output. Option A is correct. Using the base-year price with current quantity gives real GDP, while combinations involving base quantity do not represent the standard current-year GDP calculation.

Real GDP measures the quantity of current production using fixed base-year prices. Its general calculation is current-year quantity multiplied by the corresponding base-year price, with the results summed for all final goods and services. Option B is correct. Option A includes current price changes and therefore describes nominal GDP; the base-quantity combinations do not provide the standard real-GDP measure.

Real GDP uses current-year quantity with the base-year price so that price changes do not affect the measure of output. Here, real GDP = 400 units × ₹12 = ₹4,800. Therefore, option B is correct. Multiplying 400 by the current price of ₹15 gives ₹6,000, which is nominal GDP, while ₹4,000 and ₹5,400 do not follow either relevant calculation.

Nominal GDP values current production at current-year prices. Therefore, multiply the current quantity by the current price: nominal GDP = 400 × ₹15 = ₹6,000. Option C is correct. The amount ₹4,800 results from using the base price of ₹12 and is therefore real GDP. The other two amounts do not result from either of the standard calculations in the question.

The increase in real GDP is ₹1,320 crore − ₹1,200 crore = ₹120 crore. Growth rate is calculated as increase divided by the initial value, multiplied by 100: (₹120 ÷ ₹1,200) × 100 = 10%. Therefore, option B is correct. Eight and twenty percent are arithmetic errors, while 12% may result from using an unsuitable base rather than the initial GDP.

First find the increase: ₹2,300 crore − ₹2,000 crore = ₹300 crore. Nominal growth rate is calculated relative to the initial nominal GDP: (₹300 ÷ ₹2,000) × 100 = 15%. Hence, option C is correct. Ten and twelve percent do not match the calculation, whereas 30% incorrectly treats the absolute increase as a percentage without dividing by the initial value.

Nominal GDP growth reflects changes in both physical output and prices, whereas real GDP growth removes the effect of price changes. When nominal growth exceeds real growth, the difference generally indicates an increase in the overall price level, or inflation. Thus, option A is correct. Falling prices would normally make nominal growth lower, and the other statements do not logically follow from the comparison.

Nominal growth combines changes in output with changes in prices, while real growth focuses on output after removing price effects. If the general price level falls, deflation can reduce nominal growth below real growth, even when real production increases. Therefore, option A is possible and correct. A sharp price rise would usually raise nominal growth, and the other options do not explain a valid comparison of the two growth rates.

The governing relationship is Real GDP = (Nominal GDP × 100) ÷ GDP deflator. Since nominal GDP is fixed, a rise in the deflator increases the denominator and therefore lowers real GDP. Thus, option B is correct. Option A reverses the relationship, option C ignores the changing price index, and option D is unsupported because no doubling condition is given.

Nominal GDP is calculated using current prices, so it can increase because prices rise, quantities rise, or both. Consequently, a rise in nominal GDP alone does not prove that real output has increased. Option B is therefore the conclusion that is not necessarily correct. Options A, C, and D are compatible with the definition and possible causes of nominal GDP growth.

Real GDP is calculated by valuing current quantities at base-year prices: (60 × ₹20) + (40 × ₹30). The first good contributes ₹1,200 and the second contributes ₹1,200, giving total real GDP of ₹2,400. Thus option C is correct. Using current prices would calculate nominal GDP, and adding quantities without prices would not produce a monetary GDP value.

Nominal GDP values current production at current prices. For the first good, 90 × ₹12 = ₹1,080; for the second, 30 × ₹24 = ₹720. Adding these values gives ₹1,080 + ₹720 = ₹1,800. Therefore, option C is correct. Base-year prices would instead be used for real GDP, so the relevant prices here are the current prices provided.

The governing formula is Real GDP = (Nominal GDP × 100) ÷ GDP deflator. Substitution gives (₹3,360 crore × 100) ÷ 120 = ₹2,800 crore. Hence option C is correct. Because the deflator is 120, current prices are 20% above the base-year level, so real GDP should be below nominal GDP; this also confirms that ₹2,800 crore is reasonable.

The governing concept is that nominal GDP values current output at current prices, while real GDP uses base-year prices. A price level 20% above the base year corresponds to a price index of 120. Therefore, nominal GDP = real GDP × 120/100 = ₹3,000 × 1.20 = ₹3,600 crore. Hence option C is correct; the other choices use incorrect price adjustments.

Nominal GDP equals real GDP multiplied by the GDP deflator, so percentage changes must be combined multiplicatively rather than simply added or subtracted. The new nominal-to-old ratio is 1.08 × 0.95 = 1.026, which means a 2.6% increase. Thus option B is correct. The 13% figure incorrectly adds rates, while the other choices misread the combined effect.

Real GDP uses base-year prices, whereas nominal GDP uses current prices. Nominal GDP = 600 × ₹20 = ₹12,000, and real GDP = 600 × ₹16 = ₹9,600. Their difference is ₹12,000 − ₹9,600 = ₹2,400. Hence option C is correct. The other amounts result from using only one price or making an incorrect subtraction.

Nominal GDP values the final goods and services produced within an economy at the prices prevailing during the same current period. Consequently, it reflects both changes in physical output and changes in prices. Option A is correct. Base-year or constant prices are used for real GDP, while international prices and average cost are not the defining valuation basis of nominal GDP.

Real GDP is calculated by valuing current production at constant prices, normally the prices of a selected base year. This removes the direct effect of inflation and makes changes in GDP mainly represent changes in output volume. Therefore, option B is correct. Current-year prices are used for nominal GDP; next-year and world-market prices are not the standard basis for this measure.

Nominal GDP equals the value of current production measured at current prices. If the quantity of goods and services remains fixed but prices rise, the monetary value of that unchanged output rises. Thus nominal GDP increases, so option C is correct. Real GDP would remain unchanged in this simplified situation because it uses constant prices; the other options ignore the price effect.

Real GDP is designed to measure changes in production volume after holding prices constant. Therefore, when the quantity of goods and services rises and prices do not change, real GDP records a genuine increase in output. Option B is correct. The situation does not by itself show inflation, falling prices, or a change in tax rates; those are separate economic variables.

Nominal GDP values output using current prices, whereas real GDP values the same output using constant base-year prices. When prices change, the two measures can differ even if the physical quantity of production is unchanged. Hence option B, changes in prices, is the main reason. Population, imports, and interest rates may affect the economy but are not the direct measurement adjustment separating nominal from real GDP.